CN215927830U - Noise reduction fan and breathing machine - Google Patents

Abstract

The utility model discloses a noise reduction fan and a breathing machine, and relates to the technical field of medical equipment. This fan of making an uproar falls includes: the upper cover is provided with an air inlet; the lower cover is fixedly matched with the upper cover to form a volute, and an air flow channel and an air outlet communicated with the air flow channel are arranged in the volute; the impeller group is arranged in the volute and comprises a rear cover plate and long blades and short blades which are alternately arranged on the rear cover plate, an air passing air channel is formed between every two adjacent long blades and short blades, and sawteeth are arranged on the edge of the rear cover plate; the driving piece is in transmission connection with the rear cover plate. The utility model can improve the separation vortex in the airflow channel, reduce the turbulence noise generated during the centrifugal motion of the airflow, improve the working efficiency of the impeller set, reduce the noise and improve the sleep quality of patients.

Description

Noise reduction fan and breathing machine

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a noise reduction fan and a breathing machine.

Background

The breathing machine is a medical device which can replace, control or change the normal physiological respiration of a person, increase the lung ventilation, improve the respiratory function, reduce the consumption of the respiratory function and save the heart reserve capacity, and is mainly used in families, sleep treatment centers and clinics.

During the work of the breathing machine, the air guide pipeline is usually used for conveying air by adopting the fan, the air is input into the nasal cavity of a patient through the air guide pipeline and needs to be pressurized, and the noise generated by the fan in the process can be conducted out to influence the sleep quality of the patient.

Accordingly, there is a need for a noise reduction fan and a ventilator that solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a noise reduction fan and a breathing machine, which can improve separation vortex in an airflow channel, reduce turbulent flow noise generated during airflow centrifugal motion, improve the working efficiency of an impeller set, reduce noise and improve the sleep quality of a patient.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a noise reduction fan, which comprises:

the upper cover is provided with an air inlet;

the lower cover is fixedly matched with the upper cover to form a volute, and an air flow channel and an air outlet communicated with the air flow channel are arranged in the volute;

the impeller group is arranged in the volute and comprises a rear cover plate, and long blades and short blades which are alternately arranged on the rear cover plate, an air passing air channel is formed between every two adjacent long blades and short blades, and sawteeth are arranged on the edge of the rear cover plate;

and the driving piece is in transmission connection with the rear cover plate.

Optionally, the saw teeth are uniformly distributed on the edge of the rear cover plate, and the saw teeth are arranged in one-to-one correspondence with the long blades and the short blades.

Optionally, the long blade and the short blade are both arc-shaped blades, and the bending direction of the arc-shaped blades is opposite to the rotating direction of the rear cover plate.

Optionally, the radius of the volute is 3mm-4mm, and the air outlet direction of the air outlet is the radial direction of the volute.

Optionally, the gaps between the long blade and the inner wall of the upper cover and between the short blade and the inner wall of the upper cover are both 0.5mm-1 mm.

Optionally, the driving element is a driving motor, and a pair of dynamic balance blocks is arranged on a rotor in the driving motor and arranged at two ends of the rotor oppositely.

Optionally, the noise reduction fan further comprises a gas transmission pipeline and a silencer, the gas transmission pipeline is connected with the air outlet, and the silencer is connected with the gas transmission pipeline.

Optionally, the noise reduction fan further comprises a sealing element, and the gas pipeline is in sealing connection with the air outlet through the sealing element.

Optionally, the muffler includes a connecting pipe and a resonant cavity, the connecting pipe is connected to the gas pipeline, and the resonant cavity is connected to the connecting pipe.

The utility model also provides a respirator which comprises an air inlet pipeline and an air outlet pipeline, and also comprises the noise reduction fan, wherein the air inlet pipeline is connected with the air inlet, and the air outlet pipeline is connected with the air conveying pipeline.

The utility model has the beneficial effects that:

when the noise reduction fan and the respirator are used, air enters the volute from the air inlet, flows to the air outlet from the air flow channel after being rotated and centrifuged by the rotating impeller set, and provides an air source for the respirator. According to the utility model, the long blades and the short blades are alternately arranged on the rear cover plate, so that an air passing duct is formed as much as possible under the condition of not blocking the area of the air inlet, the separation vortex in the air flow channel is greatly improved, the working efficiency of the impeller set is improved, and the noise is reduced; simultaneously, set up the sawtooth at the edge of back apron to the air current that flows is cuted the breakage, is reduced the turbulent noise that produces when air current centrifugal motion, further plays noise reduction effect, improves patient's sleep quality.

Drawings

Fig. 1 is a schematic view of an overall split structure of a noise reduction fan according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a partially disassembled structure of a noise reduction fan according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a blade group in a noise reduction fan according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an impeller assembly provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a matching structure of an impeller assembly and a lower cover of a noise reduction fan according to an embodiment of the present invention;

FIG. 6 is a schematic view of a noise reduction fan according to an embodiment of the present invention in a partial cross-sectional view;

fig. 7 is a schematic cross-sectional view of a muffler and an air pipe according to an embodiment of the present invention.

In the figure:

1. an upper cover; 11. an air inlet; 2. a lower cover; 3. a volute; 31. an air outlet; 4. an impeller assembly; 41. a long blade; 42. short blades; 421. an air duct; 43. a rear cover plate; 431. saw teeth; 5. a drive member; 6. a gas transmission pipeline; 7. a seal member; 8. a muffler; 81. a connecting pipe; 82. a resonant cavity.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

The embodiment of the utility model discloses a noise reduction fan, which comprises an upper cover 1, a lower cover 2, an impeller group 4 and a driving piece 5, wherein the upper cover 1 and the lower cover 2 are matched and fixed, and the impeller group 4 and the driving piece 5 are arranged in the upper cover 1 and the lower cover 2, as shown in figures 1-7. Specifically, the upper cover 1 is provided with an air inlet 11. The lower cover 2 and the upper cover 1 are fixedly matched to form a volute 3, and an air flow channel and an air outlet 31 communicated with the air flow channel are arranged in the volute 3. The impeller assembly 4 is arranged in the volute 3, the impeller assembly 4 comprises a rear cover plate 43 and long blades 41 and short blades 42 alternately arranged on the rear cover plate 43, an air passing duct 421 is formed between every two adjacent long blades 41 and short blades 42, and sawteeth 431 are arranged on the edge of the rear cover plate 43. The driving member 5 is in transmission connection with the rear cover plate 43. When the air supply device is used, air enters the volute 3 from the air inlet 11, flows to the air outlet 31 from the air flow channel after being rotated and centrifuged by the rotating impeller set 4, and an air source is provided for the breathing machine.

According to the utility model, the long blades 41 and the short blades 42 are alternately arranged on the rear cover plate 43, so that the air passing channel 421 is formed as much as possible under the condition of not blocking the area of the air inlet 11, the separation vortex in the air flow channel is greatly improved, the working efficiency of the impeller set 4 is improved, and the noise is reduced; meanwhile, the sawtooth 431 is arranged on the edge of the rear cover plate 43 to shear and crush the flowing air flow, reduce the turbulence noise generated during the centrifugal movement of the air flow, further achieve the noise reduction effect and improve the sleeping quality of the patient.

Optionally, the upper cover 1 and the lower cover 2 are assembled and matched to form the volute 3 through threaded fasteners, which may be screws or bolts, and are convenient to disassemble, assemble and maintain. The radius of the volute 3 is 3mm-4mm, for example, the radius is 3mm, 3.5mm or 4mm, so as to further reduce the gas turbulence noise. An annular airflow channel and an air outlet 31 extending along the airflow channel are formed in the volute 3, namely the air outlet direction of the air outlet 31 is the radial direction of the volute 3, so that the air flows out along the air outlet 31 tangentially after being subjected to centrifugal motion in the airflow channel, the gas pressurization path is shortened as much as possible, pressurized air in the range of 2cmH2O-60cmH2O can be output, the altitude compensation and air leakage compensation of a breathing machine can be met, and the flow can reach 240L/min. Of course, in other embodiments, the upper cover 1 and the lower cover 2 may be assembled and fixed by using a pin joint, a rivet joint, and the like, and are not limited to this embodiment.

Further, the long blades 41 and the short blades 42 are both arc-shaped blades, so as to form an arc-shaped air passing duct 421, improve the turning angle of the inflow air, and reduce the energy loss. The bending direction of the arc-shaped blades is opposite to the rotation direction of the rear cover plate 43, when the airflow enters the impeller set 4 in the volute 3 from the air inlet 11, the rotating impeller set 4 rotates and centrifuges the airflow to the air outlet 31 to flow out, and the airflow pressurization is realized.

In the embodiment, as for the specific process, the long blade 41 and the short blade 42 are both formed by injection molding of medical grade PBT plus 30% glass fiber material or PEET, and have good toughness and light weight. In terms of number and size setting, the sum of the number of the long blades 41 and the short blades 42 is 26, the outlet widths of the long blades 41 and the short blades 42 are both 4.5mm, and the inlet widths of the long blades 41 and the short blades 42 are both 5mm-10mm, so that airflow can conveniently flow into and out of the impeller set 4; the diameter of the arc formed by the outlet end enclosure of the long blade 41 and the short blade 42 is 43mm, and the diameter of the arc formed by the inlet end enclosure is between 10mm and 30 mm. Of course, in other embodiments, the processing technology, the setting number and the size of the long blade 41 and the short blade 42 can be adjusted according to the requirement, and are not limited to the embodiment.

In addition, the clearance between the long blades 41 and the short blades 42 and the inner wall of the upper cover 1 is 0.5mm-1mm, wherein the performance is optimized by 0.75mm, and the turbulent noise caused by gas backflow can be reduced.

As shown in fig. 2-4, as a specific embodiment of this embodiment, the rear cover plate 43 is a convex arc plate, the center of which is higher than the edge, and the arc is matched with the arc of the upper cover 1, so as to perform a split centrifugal movement on the air flow entering at the air inlet 11 of the upper cover 1.

Further, the saw teeth 431 are uniformly distributed on the edge of the rear cover plate 43, and the saw teeth 431 are arranged corresponding to the long blades 41 and the short blades 42. Specifically, the number of the serrations 431 is equal to the number of the long and short blades 41 and 42, and is uniformly distributed at the outlet positions of the long and short blades 41 and 42 to reduce turbulence noise.

As shown in fig. 5 and 6, the impeller assembly 4 in this embodiment is a semi-closed structure without a front cover plate (only the rear cover plate 43 is provided), so that the weight and volume of the whole noise reduction fan are reduced.

Optionally, the driving part 5 is a driving motor, the driving motor is located inside the installation cavity of the lower cover 2, and an output shaft of the driving motor is in interference fit with a central hole of the rear cover plate 43, so as to drive the whole impeller assembly 4 to rotate, thereby realizing rotation and centrifugation of the air flow.

Specifically, the driving motor is designed as a three-phase two-pole inner rotor brushless dc motor, the coils of the driving motor are designed to be of a skeleton-free structure, the rotor of the driving motor is provided with a pair of dynamic balance blocks (not shown in the figure), and the pair of dynamic balance blocks are arranged at two ends of the rotor relatively, so that the material reduction dynamic balance of the rotor is facilitated, the rotation stability is improved, and the noise is further reduced. In terms of specific material, the material of the dynamic balance block can be copper, aluminum or other non-magnetic materials. In this embodiment, the driving member 5 is a three-phase two-pole inner rotor brushless dc motor, the rotational inertia of the driving member is smaller than that of the outer rotor motor, and the dynamic balance block is arranged to improve the working stability of the motor, so that the time consumed by the noise reduction fan for reducing the static pressure from 10cmH2O to 4cmH2O is not more than 3 seconds, the response is fast, the inertia time is short, and the use requirement of the bi-level breathing machine can be met.

In the noise reduction fan of the embodiment, after the impeller assembly 4, the driving motor and the lower cover 2 are assembled, material reduction dynamic balance processing is required to be carried out, so that the dynamic balance grade of the noise reduction fan reaches G2.5, and vibration and mechanical noise caused by unbalanced rotor mass or misaligned rotor installation are reduced.

As shown in fig. 1 and 7, for further reducing noise, the noise reduction fan further comprises a gas transmission pipeline 6 and a silencer 8, wherein the gas transmission pipeline 6 is connected with the air outlet 31, and the silencer 8 is connected with the gas transmission pipeline 6 so as to eliminate noise of gas flow flowing out of the air outlet 31, reduce noise and improve sleep quality of a patient.

In order to avoid gas leakage at the joint of the gas pipeline 6 and the air outlet 31, the noise reduction fan further comprises a sealing element 7, and the gas pipeline 6 is connected with the air outlet 31 in a sealing manner through the sealing element 7. In this embodiment, the sealing member 7 is a sealing ring, which is convenient to manufacture and has low cost.

Specifically, the muffler 8 includes a connection pipe 81 and a resonance chamber 82, the connection pipe 81 is connected to the air pipe 6, and the resonance chamber 82 is connected to the connection pipe 81. According to the arrangement, the air flow enters the resonant cavity 82 through the air transmission pipeline 6 and the connecting pipe 81 to realize resonance noise reduction, and the noise-reduced air flow flows out through the connecting pipe 81 and the air transmission pipeline 6. More specifically, the resonance cavity 82 is a cylindrical cavity with a diameter of 55mm, and the connection pipe 81 has a diameter of 15mm, although in other embodiments, the shape and size of the resonance cavity 82 and the size of the connection pipe 81 can be set according to the requirement, and are not limited to this embodiment.

Through the arrangement, the whole noise reduction fan has the characteristics of large wind pressure and wind quantity, small volume, low noise and quick response.

In addition, this embodiment has still disclosed a breathing machine, and it includes air inlet pipeline and air outlet pipeline, this breathing machine still include as before the fan of making an uproar falls, wherein, air inlet pipeline is connected with air intake 11, and air outlet pipeline is connected with gas transmission pipeline 6. Therefore, the air flow which is subjected to noise reduction and silencing flows into the breathing machine to realize oxygen supply for the patient, and the sleep quality of the patient is ensured.

Optionally, the ventilator in this embodiment is a bi-level ventilator, which can provide two different positive airway pressures for the patient, and when the patient inhales, a higher pressure is provided to facilitate inhalation and keep the airway open, and when the patient exhales, a lower pressure is provided to facilitate exhalation and ensure smooth respiration of the patient. Of course, in other embodiments, the type of ventilator may be selected according to the need, and is not limited to the present embodiment.

In summary, the embodiment of the present invention provides a noise reduction fan and a breathing machine, which have the following advantages:

(1) by adopting the form of alternately arranging the long blades 41 and the short blades 42 on the rear cover plate 43, the formation of the air passing duct 421 as much as possible is ensured under the condition of not blocking the area of the air inlet 11, the separation vortex in the air flow passage is greatly improved, the working efficiency of the impeller set 4 is improved, and the noise is reduced;

(2) the sawtooth 431 is arranged on the edge of the rear cover plate 43 to shear and crush the outgoing airflow, reduce the turbulence noise generated during the centrifugal motion of the airflow, play a role in noise reduction and improve the sleeping quality of a patient;

(3) the silencer 8 is arranged to eliminate noise of the airflow output from the air outlet 31, so that noise is reduced, and the sleeping quality of a patient is improved;

(4) the driving piece 5 is designed into a three-phase two-pole inner rotor brushless DC motor, and the rotor of the motor is provided with a pair of dynamic balance blocks, so that the rotor material reduction dynamic balance is facilitated, the rotation stability is improved, and the noise is further reduced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A noise reduction fan, comprising:

the air conditioner comprises an upper cover (1), wherein an air inlet (11) is formed in the upper cover (1);

the lower cover (2) is fixedly matched with the upper cover (1) to form a volute (3), and an air flow channel and an air outlet (31) communicated with the air flow channel are arranged in the volute (3);

the impeller group (4) is arranged in the volute (3), the impeller group (4) comprises a rear cover plate (43) and long blades (41) and short blades (42) which are alternately arranged on the rear cover plate (43), an air passing duct (421) is formed between every two adjacent long blades (41) and short blades (42), and sawteeth (431) are arranged on the edge of the rear cover plate (43);

and the driving piece (5) is in transmission connection with the rear cover plate (43).

2. The noise reduction fan according to claim 1, wherein the sawteeth (431) are provided in a plurality and uniformly distributed on the edge of the rear cover plate (43), and the sawteeth (431) are provided in one-to-one correspondence with the long blades (41) and the short blades (42).

3. The noise reduction fan according to claim 1, wherein the long blade (41) and the short blade (42) are both arc-shaped blades, and the bending direction of the arc-shaped blades is opposite to the rotation direction of the rear cover plate (43).

4. The noise reduction fan according to claim 1, wherein the radius of the volute (3) is 3mm-4mm, and the air outlet direction of the air outlet (31) is the radial direction of the volute (3).

5. The noise reduction fan according to claim 1, wherein the long blades (41) and the short blades (42) are spaced from the inner wall of the upper cover (1) by 0.5mm to 1 mm.

6. The noise reduction fan according to claim 1, wherein the driving member (5) is a driving motor, and a pair of dynamic balance blocks is provided on a rotor in the driving motor, and the pair of dynamic balance blocks is oppositely arranged at two ends of the rotor.

7. The noise reduction fan according to any one of claims 1 to 6, further comprising an air transmission pipeline (6) and a silencer (8), wherein the air transmission pipeline (6) is connected with the air outlet (31), and the silencer (8) is connected with the air transmission pipeline (6).

8. The noise reduction fan according to claim 7, further comprising a sealing member (7), wherein the air transmission pipeline (6) is connected with the air outlet (31) in a sealing manner through the sealing member (7).

9. The noise reduction fan according to claim 7, wherein the muffler (8) comprises a connecting pipe (81) and a resonance chamber (82), the connecting pipe (81) being connected with the air transmission pipeline (6), the resonance chamber (82) being connected with the connecting pipe (81).

10. A respirator comprising an air inlet pipeline and an air outlet pipeline, characterized in that the respirator further comprises a noise reduction fan according to any one of claims 1 to 9, wherein the air inlet pipeline is connected with the air inlet (11), and the air outlet pipeline is connected with the air delivery pipeline (6).

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